[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add spherical_length() function to geometries in Lua (PR #2474)

[Jochen Topf]

For linestrings and multilinestrings this returns the same value as the PostGIS ST_Length() function on a geography. For other geometry types this always returns 0.0.
You can view, comment on, or merge this pull request online at:

  https://github.com/osm2pgsql-dev/osm2pgsql/pull/2474

-- Commit Summary --

  * Add spherical_length() function to geometries in Lua

-- File Changes --

    M src/flex-lua-geom.cpp (20)
    M src/geom-functions.cpp (37)
    M src/geom-functions.hpp (11)
    M tests/bdd/flex/geometry-linestring.feature (12)
    M tests/test-geom-linestrings.cpp (23)
    M tests/test-geom-multilinestrings.cpp (3)
    M tests/test-geom-multipoints.cpp (1)
    M tests/test-geom-multipolygons.cpp (1)
    M tests/test-geom-null.cpp (1)
    M tests/test-geom-points.cpp (1)
    M tests/test-geom-polygons.cpp (1)

-- Patch Links --

https://github.com/osm2pgsql-dev/osm2pgsql/pull/2474.patchhttps://github.com/osm2pgsql-dev/osm2pgsql/pull/2474.diff
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